238 lines
15 KiB
HTML
238 lines
15 KiB
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<?xml version="1.0" ?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>provider-asym_cipher</title>
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<meta http-equiv="content-type" content="text/html; charset=utf-8" />
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<link rev="made" href="mailto:" />
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</head>
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<body>
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<ul id="index">
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<li><a href="#NAME">NAME</a></li>
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<li><a href="#SYNOPSIS">SYNOPSIS</a></li>
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<li><a href="#DESCRIPTION">DESCRIPTION</a>
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<ul>
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<li><a href="#Context-Management-Functions">Context Management Functions</a></li>
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<li><a href="#Encryption-Functions">Encryption Functions</a></li>
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<li><a href="#Decryption-Functions">Decryption Functions</a></li>
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<li><a href="#Asymmetric-Cipher-Parameters">Asymmetric Cipher Parameters</a></li>
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</ul>
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</li>
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<li><a href="#RETURN-VALUES">RETURN VALUES</a></li>
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<li><a href="#SEE-ALSO">SEE ALSO</a></li>
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<li><a href="#HISTORY">HISTORY</a></li>
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<li><a href="#COPYRIGHT">COPYRIGHT</a></li>
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</ul>
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<h1 id="NAME">NAME</h1>
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<p>provider-asym_cipher - The asym_cipher library <-> provider functions</p>
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<h1 id="SYNOPSIS">SYNOPSIS</h1>
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<pre><code> #include <openssl/core_dispatch.h>
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#include <openssl/core_names.h>
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/*
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* None of these are actual functions, but are displayed like this for
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* the function signatures for functions that are offered as function
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* pointers in OSSL_DISPATCH arrays.
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*/
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/* Context management */
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void *OSSL_FUNC_asym_cipher_newctx(void *provctx);
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void OSSL_FUNC_asym_cipher_freectx(void *ctx);
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void *OSSL_FUNC_asym_cipher_dupctx(void *ctx);
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/* Encryption */
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int OSSL_FUNC_asym_cipher_encrypt_init(void *ctx, void *provkey,
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const OSSL_PARAM params[]);
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int OSSL_FUNC_asym_cipher_encrypt(void *ctx, unsigned char *out, size_t *outlen,
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size_t outsize, const unsigned char *in,
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size_t inlen);
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/* Decryption */
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int OSSL_FUNC_asym_cipher_decrypt_init(void *ctx, void *provkey,
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const OSSL_PARAM params[]);
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int OSSL_FUNC_asym_cipher_decrypt(void *ctx, unsigned char *out, size_t *outlen,
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size_t outsize, const unsigned char *in,
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size_t inlen);
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/* Asymmetric Cipher parameters */
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int OSSL_FUNC_asym_cipher_get_ctx_params(void *ctx, OSSL_PARAM params[]);
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const OSSL_PARAM *OSSL_FUNC_asym_cipher_gettable_ctx_params(void *provctx);
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int OSSL_FUNC_asym_cipher_set_ctx_params(void *ctx, const OSSL_PARAM params[]);
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const OSSL_PARAM *OSSL_FUNC_asym_cipher_settable_ctx_params(void *provctx);</code></pre>
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<h1 id="DESCRIPTION">DESCRIPTION</h1>
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<p>This documentation is primarily aimed at provider authors. See <a href="../man7/provider.html">provider(7)</a> for further information.</p>
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<p>The asymmetric cipher (OSSL_OP_ASYM_CIPHER) operation enables providers to implement asymmetric cipher algorithms and make them available to applications via the API functions <a href="../man3/EVP_PKEY_encrypt.html">EVP_PKEY_encrypt(3)</a>, <a href="../man3/EVP_PKEY_decrypt.html">EVP_PKEY_decrypt(3)</a> and other related functions).</p>
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<p>All "functions" mentioned here are passed as function pointers between <i>libcrypto</i> and the provider in <a href="../man3/OSSL_DISPATCH.html">OSSL_DISPATCH(3)</a> arrays via <a href="../man3/OSSL_ALGORITHM.html">OSSL_ALGORITHM(3)</a> arrays that are returned by the provider's provider_query_operation() function (see <a href="../man7/provider-base.html">"Provider Functions" in provider-base(7)</a>).</p>
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<p>All these "functions" have a corresponding function type definition named <b>OSSL_FUNC_{name}_fn</b>, and a helper function to retrieve the function pointer from an <a href="../man3/OSSL_DISPATCH.html">OSSL_DISPATCH(3)</a> element named <b>OSSL_FUNC_{name}</b>. For example, the "function" OSSL_FUNC_asym_cipher_newctx() has these:</p>
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<pre><code> typedef void *(OSSL_FUNC_asym_cipher_newctx_fn)(void *provctx);
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static ossl_inline OSSL_FUNC_asym_cipher_newctx_fn
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OSSL_FUNC_asym_cipher_newctx(const OSSL_DISPATCH *opf);</code></pre>
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<p><a href="../man3/OSSL_DISPATCH.html">OSSL_DISPATCH(3)</a> arrays are indexed by numbers that are provided as macros in <a href="../man7/openssl-core_dispatch.h.html">openssl-core_dispatch.h(7)</a>, as follows:</p>
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<pre><code> OSSL_FUNC_asym_cipher_newctx OSSL_FUNC_ASYM_CIPHER_NEWCTX
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OSSL_FUNC_asym_cipher_freectx OSSL_FUNC_ASYM_CIPHER_FREECTX
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OSSL_FUNC_asym_cipher_dupctx OSSL_FUNC_ASYM_CIPHER_DUPCTX
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OSSL_FUNC_asym_cipher_encrypt_init OSSL_FUNC_ASYM_CIPHER_ENCRYPT_INIT
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OSSL_FUNC_asym_cipher_encrypt OSSL_FUNC_ASYM_CIPHER_ENCRYPT
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OSSL_FUNC_asym_cipher_decrypt_init OSSL_FUNC_ASYM_CIPHER_DECRYPT_INIT
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OSSL_FUNC_asym_cipher_decrypt OSSL_FUNC_ASYM_CIPHER_DECRYPT
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OSSL_FUNC_asym_cipher_get_ctx_params OSSL_FUNC_ASYM_CIPHER_GET_CTX_PARAMS
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OSSL_FUNC_asym_cipher_gettable_ctx_params OSSL_FUNC_ASYM_CIPHER_GETTABLE_CTX_PARAMS
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OSSL_FUNC_asym_cipher_set_ctx_params OSSL_FUNC_ASYM_CIPHER_SET_CTX_PARAMS
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OSSL_FUNC_asym_cipher_settable_ctx_params OSSL_FUNC_ASYM_CIPHER_SETTABLE_CTX_PARAMS</code></pre>
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<p>An asymmetric cipher algorithm implementation may not implement all of these functions. In order to be a consistent set of functions a provider must implement OSSL_FUNC_asym_cipher_newctx and OSSL_FUNC_asym_cipher_freectx. It must also implement both of OSSL_FUNC_asym_cipher_encrypt_init and OSSL_FUNC_asym_cipher_encrypt, or both of OSSL_FUNC_asym_cipher_decrypt_init and OSSL_FUNC_asym_cipher_decrypt. OSSL_FUNC_asym_cipher_get_ctx_params is optional but if it is present then so must OSSL_FUNC_asym_cipher_gettable_ctx_params. Similarly, OSSL_FUNC_asym_cipher_set_ctx_params is optional but if it is present then so must OSSL_FUNC_asym_cipher_settable_ctx_params.</p>
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<p>An asymmetric cipher algorithm must also implement some mechanism for generating, loading or importing keys via the key management (OSSL_OP_KEYMGMT) operation. See <a href="../man7/provider-keymgmt.html">provider-keymgmt(7)</a> for further details.</p>
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<h2 id="Context-Management-Functions">Context Management Functions</h2>
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<p>OSSL_FUNC_asym_cipher_newctx() should create and return a pointer to a provider side structure for holding context information during an asymmetric cipher operation. A pointer to this context will be passed back in a number of the other asymmetric cipher operation function calls. The parameter <i>provctx</i> is the provider context generated during provider initialisation (see <a href="../man7/provider.html">provider(7)</a>).</p>
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<p>OSSL_FUNC_asym_cipher_freectx() is passed a pointer to the provider side asymmetric cipher context in the <i>ctx</i> parameter. This function should free any resources associated with that context.</p>
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<p>OSSL_FUNC_asym_cipher_dupctx() should duplicate the provider side asymmetric cipher context in the <i>ctx</i> parameter and return the duplicate copy.</p>
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<h2 id="Encryption-Functions">Encryption Functions</h2>
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<p>OSSL_FUNC_asym_cipher_encrypt_init() initialises a context for an asymmetric encryption given a provider side asymmetric cipher context in the <i>ctx</i> parameter, and a pointer to a provider key object in the <i>provkey</i> parameter. The <i>params</i>, if not NULL, should be set on the context in a manner similar to using OSSL_FUNC_asym_cipher_set_ctx_params(). The key object should have been previously generated, loaded or imported into the provider using the key management (OSSL_OP_KEYMGMT) operation (see <a href="../man7/provider-keymgmt.html">provider-keymgmt(7)</a>). OSSL_FUNC_asym_cipher_encrypt() performs the actual encryption itself. A previously initialised asymmetric cipher context is passed in the <i>ctx</i> parameter. The data to be encrypted is pointed to by the <i>in</i> parameter which is <i>inlen</i> bytes long. Unless <i>out</i> is NULL, the encrypted data should be written to the location pointed to by the <i>out</i> parameter and it should not exceed <i>outsize</i> bytes in length. The length of the encrypted data should be written to <i>*outlen</i>. If <i>out</i> is NULL then the maximum length of the encrypted data should be written to <i>*outlen</i>.</p>
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<h2 id="Decryption-Functions">Decryption Functions</h2>
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<p>OSSL_FUNC_asym_cipher_decrypt_init() initialises a context for an asymmetric decryption given a provider side asymmetric cipher context in the <i>ctx</i> parameter, and a pointer to a provider key object in the <i>provkey</i> parameter. The <i>params</i>, if not NULL, should be set on the context in a manner similar to using OSSL_FUNC_asym_cipher_set_ctx_params(). The key object should have been previously generated, loaded or imported into the provider using the key management (OSSL_OP_KEYMGMT) operation (see <a href="../man7/provider-keymgmt.html">provider-keymgmt(7)</a>).</p>
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<p>OSSL_FUNC_asym_cipher_decrypt() performs the actual decryption itself. A previously initialised asymmetric cipher context is passed in the <i>ctx</i> parameter. The data to be decrypted is pointed to by the <i>in</i> parameter which is <i>inlen</i> bytes long. Unless <i>out</i> is NULL, the decrypted data should be written to the location pointed to by the <i>out</i> parameter and it should not exceed <i>outsize</i> bytes in length. The length of the decrypted data should be written to <i>*outlen</i>. If <i>out</i> is NULL then the maximum length of the decrypted data should be written to <i>*outlen</i>.</p>
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<h2 id="Asymmetric-Cipher-Parameters">Asymmetric Cipher Parameters</h2>
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<p>See <a href="../man3/OSSL_PARAM.html">OSSL_PARAM(3)</a> for further details on the parameters structure used by the OSSL_FUNC_asym_cipher_get_ctx_params() and OSSL_FUNC_asym_cipher_set_ctx_params() functions.</p>
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<p>OSSL_FUNC_asym_cipher_get_ctx_params() gets asymmetric cipher parameters associated with the given provider side asymmetric cipher context <i>ctx</i> and stores them in <i>params</i>. Passing NULL for <i>params</i> should return true.</p>
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<p>OSSL_FUNC_asym_cipher_set_ctx_params() sets the asymmetric cipher parameters associated with the given provider side asymmetric cipher context <i>ctx</i> to <i>params</i>. Any parameter settings are additional to any that were previously set. Passing NULL for <i>params</i> should return true.</p>
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<p>Parameters currently recognised by built-in asymmetric cipher algorithms are as follows. Not all parameters are relevant to, or are understood by all asymmetric cipher algorithms:</p>
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<dl>
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<dt id="pad-mode-OSSL_ASYM_CIPHER_PARAM_PAD_MODE-UTF8-string-OR-integer">"pad-mode" (<b>OSSL_ASYM_CIPHER_PARAM_PAD_MODE</b>) <UTF8 string> OR <integer></dt>
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<dd>
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<p>The type of padding to be used. The interpretation of this value will depend on the algorithm in use.</p>
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</dd>
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<dt id="digest-OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST-UTF8-string">"digest" (<b>OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST</b>) <UTF8 string></dt>
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<dd>
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<p>Gets or sets the name of the OAEP digest algorithm used when OAEP padding is in use.</p>
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</dd>
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<dt id="digest-OSSL_ASYM_CIPHER_PARAM_DIGEST-UTF8-string">"digest" (<b>OSSL_ASYM_CIPHER_PARAM_DIGEST</b>) <UTF8 string></dt>
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<dd>
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<p>Gets or sets the name of the digest algorithm used by the algorithm (where applicable).</p>
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</dd>
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<dt id="digest-props-OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST_PROPS-UTF8-string">"digest-props" (<b>OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST_PROPS</b>) <UTF8 string></dt>
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<dd>
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<p>Gets or sets the properties to use when fetching the OAEP digest algorithm.</p>
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</dd>
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<dt id="digest-props-OSSL_ASYM_CIPHER_PARAM_DIGEST_PROPS-UTF8-string">"digest-props" (<b>OSSL_ASYM_CIPHER_PARAM_DIGEST_PROPS</b>) <UTF8 string></dt>
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<dd>
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<p>Gets or sets the properties to use when fetching the cipher digest algorithm.</p>
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</dd>
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<dt id="mgf1-digest-OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST-UTF8-string">"mgf1-digest" (<b>OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST</b>) <UTF8 string></dt>
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<dd>
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<p>Gets or sets the name of the MGF1 digest algorithm used when OAEP or PSS padding is in use.</p>
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</dd>
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<dt id="mgf1-digest-props-OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS-UTF8-string">"mgf1-digest-props" (<b>OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS</b>) <UTF8 string></dt>
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<dd>
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<p>Gets or sets the properties to use when fetching the MGF1 digest algorithm.</p>
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</dd>
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<dt id="oaep-label-OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL-octet-string-ptr">"oaep-label" (<b>OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL</b>) <octet string ptr></dt>
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<dd>
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<p>Gets the OAEP label used when OAEP padding is in use.</p>
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</dd>
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<dt id="oaep-label-OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL-octet-string">"oaep-label" (<b>OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL</b>) <octet string></dt>
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<dd>
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<p>Sets the OAEP label used when OAEP padding is in use.</p>
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</dd>
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<dt id="tls-client-version-OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION-unsigned-integer">"tls-client-version" (<b>OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION</b>) <unsigned integer></dt>
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<dd>
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<p>The TLS protocol version first requested by the client.</p>
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</dd>
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<dt id="tls-negotiated-version-OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION-unsigned-integer">"tls-negotiated-version" (<b>OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION</b>) <unsigned integer></dt>
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<dd>
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<p>The negotiated TLS protocol version.</p>
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</dd>
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<dt id="implicit-rejection-OSSL_PKEY_PARAM_IMPLICIT_REJECTION-unsigned-integer">"implicit-rejection" (<b>OSSL_PKEY_PARAM_IMPLICIT_REJECTION</b>) <unsigned integer></dt>
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<dd>
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<p>Gets of sets the use of the implicit rejection mechanism for RSA PKCS#1 v1.5 decryption. When set (non zero value), the decryption API will return a deterministically random value if the PKCS#1 v1.5 padding check fails. This makes exploitation of the Bleichenbacher significantly harder, even if the code using the RSA decryption API is not implemented in side-channel free manner. Set by default.</p>
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</dd>
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</dl>
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<p>OSSL_FUNC_asym_cipher_gettable_ctx_params() and OSSL_FUNC_asym_cipher_settable_ctx_params() get a constant <a href="../man3/OSSL_PARAM.html">OSSL_PARAM(3)</a> array that describes the gettable and settable parameters, i.e. parameters that can be used with OSSL_FUNC_asym_cipherget_ctx_params() and OSSL_FUNC_asym_cipher_set_ctx_params() respectively.</p>
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<h1 id="RETURN-VALUES">RETURN VALUES</h1>
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<p>OSSL_FUNC_asym_cipher_newctx() and OSSL_FUNC_asym_cipher_dupctx() should return the newly created provider side asymmetric cipher context, or NULL on failure.</p>
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<p>All other functions should return 1 for success or 0 on error.</p>
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<h1 id="SEE-ALSO">SEE ALSO</h1>
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<p><a href="../man7/provider.html">provider(7)</a></p>
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<h1 id="HISTORY">HISTORY</h1>
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<p>The provider ASYM_CIPHER interface was introduced in OpenSSL 3.0.</p>
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<h1 id="COPYRIGHT">COPYRIGHT</h1>
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<p>Copyright 2019-2023 The OpenSSL Project Authors. All Rights Reserved.</p>
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<p>Licensed under the Apache License 2.0 (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>
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</body>
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